[StuttgartDavid]

If you are club racing and have the $ and dyno time to optimize everything about the motor, it may be worth the marginal benefit.
If not, the gain will be incremental at best, and a setback at worst, because that later closed loop system can compensate for a multitude of sins, whereas you will need everything spot-on and dialed in to get any benefit from the ealier open system. The real limitation on power with that engine is the cam, not the intake.
I suspect you will get much more bang for your buck putting the $ and time elsewhere. Do you have SSIs or the early exhaust? Do that first. Have you upgraded the suspension and tires/rims? Have you upgraded yourself as a driver via DE, Time Trials or autocross? These last two are the real way to make your car faster in the real sense of the word - the ability to cover a fixed distance in a shorter period of time.